MasterTuning Fault code dictionary (DTC)

P2421 — Evaporative Emission System Vent Valve Stuck Open

Severity: Informational Can you drive? With caution: limp mode possible, have it checked soon Make: All makes (OBD-II standard)
MeaningEvaporative Emission System Vent Valve Stuck Open.
FamilyPowertrain (P)

Frequently asked questions

What does code P2421 mean?

Evaporative Emission System Vent Valve Stuck Open. Evaporative Emission System Vent Valve Stuck Open.

Can I keep driving with code P2421 active?

With caution: limp mode possible, have it checked soon

How do you fix code P2421?

Diagnosis starts from reading the live ECU parameters: the code points to the fault area, not to the part to replace. A vehicle-electronics specialist can test the component and clear the code after the repair.

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